Compare.java revision f6c387128427e121477c1b32ad35cdcaa5101ba3 
1// Copyright 2008 The Android Open Source Project
2
3
4
5/**
6 * Test comparison operators.
7 */
8public class Compare {
9
10    /*
11     * Test the integer comparisons in various ways.
12     */
13    static void testIntCompare(int minus, int plus, int plus2, int zero) {
14        System.out.println("IntMath.testIntCompare");
15
16        if (minus > plus)
17            assert(false);
18        if (minus >= plus)
19            assert(false);
20        if (plus < minus)
21            assert(false);
22        if (plus <= minus)
23            assert(false);
24        if (plus == minus)
25            assert(false);
26        if (plus != plus2)
27            assert(false);
28
29        /* try a branch-taken */
30        if (plus != minus) {
31            assert(true);
32        } else {
33            assert(false);
34        }
35
36        if (minus > 0)
37            assert(false);
38        if (minus >= 0)
39            assert(false);
40        if (plus < 0)
41            assert(false);
42        if (plus <= 0)
43            assert(false);
44        if (plus == 0)
45            assert(false);
46        if (zero != 0)
47            assert(false);
48
49        if (zero == 0) {
50            assert(true);
51        } else {
52            assert(false);
53        }
54    }
55
56    /*
57     * Test cmp-long.
58     *
59     * minus=-5, alsoMinus=0xFFFFFFFF00000009, plus=4, alsoPlus=8
60     */
61    static void testLongCompare(long minus, long alsoMinus, long plus,
62        long alsoPlus) {
63
64        System.out.println("IntMath.testLongCompare");
65        if (minus > plus)
66            assert(false);
67        if (plus < minus)
68            assert(false);
69        if (plus == minus)
70            assert(false);
71
72        if (plus >= plus+1)
73            assert(false);
74        if (minus >= minus+1)
75            assert(false);
76
77        /* try a branch-taken */
78        if (plus != minus) {
79            assert(true);
80        } else {
81            assert(false);
82        }
83
84        /* compare when high words are equal but low words differ */
85        if (plus > alsoPlus)
86            assert(false);
87        if (alsoPlus < plus)
88            assert(false);
89        if (alsoPlus == plus)
90            assert(false);
91
92        /* high words are equal, low words have apparently different signs */
93        if (minus < alsoMinus)      // bug!
94            assert(false);
95        if (alsoMinus > minus)
96            assert(false);
97        if (alsoMinus == minus)
98            assert(false);
99    }
100
101    /*
102     * Test cmpl-float and cmpg-float.
103     */
104    static void testFloatCompare(float minus, float plus, float plus2,
105        float nan) {
106
107        System.out.println("IntMath.testFloatCompare");
108        if (minus > plus)
109            assert(false);
110        if (plus < minus)
111            assert(false);
112        if (plus == minus)
113            assert(false);
114        if (plus != plus2)
115            assert(false);
116
117        if (plus <= nan)
118            assert(false);
119        if (plus >= nan)
120            assert(false);
121        if (minus <= nan)
122            assert(false);
123        if (minus >= nan)
124            assert(false);
125        if (nan >= plus)
126            assert(false);
127        if (nan <= plus)
128            assert(false);
129
130        if (nan == nan)
131            assert(false);
132    }
133
134    static void testDoubleCompare(double minus, double plus, double plus2,
135        double nan) {
136
137        System.out.println("IntMath.testDoubleCompare");
138        if (minus > plus)
139            assert(false);
140        if (plus < minus)
141            assert(false);
142        if (plus == minus)
143            assert(false);
144        if (plus != plus2)
145            assert(false);
146
147        if (plus <= nan)
148            assert(false);
149        if (plus >= nan)
150            assert(false);
151        if (minus <= nan)
152            assert(false);
153        if (minus >= nan)
154            assert(false);
155        if (nan >= plus)
156            assert(false);
157        if (nan <= plus)
158            assert(false);
159
160        if (nan == nan)
161            assert(false);
162    }
163
164    public static void run() {
165        testIntCompare(-5, 4, 4, 0);
166        testLongCompare(-5L, -4294967287L, 4L, 8L);
167
168        testFloatCompare(-5.0f, 4.0f, 4.0f, (1.0f/0.0f) / (1.0f/0.0f));
169        testDoubleCompare(-5.0, 4.0, 4.0, (1.0/0.0) / (1.0/0.0));
170    }
171}
172
173